How to search a value and replace in array?

Map the array to a new array, and call .replace (or, more appropriately, .replaceAll) on every item.

const input = ['asd dsa', 'asd', 'dsa asd', 'abc'];
const result = input.map(
  str => str.replaceAll('asd', 'abc')
);
console.log(result);